John Gill Commentary Psalms 89:34

"My covenant will I not break, Nor alter the thing that is gone out of my lips." — Psalms 89:34 (ASV)

My covenant will I not break
Not the covenant at Sinai, as Aben Ezra, but the covenant of grace made with Christ, and which stands fast with him, (Psalms 89:3Psalms 89:28) , which is firm, sure, and stable, and as immovable as mountains and hills, and more so, (2 Samuel 23:5) (Isaiah 54:10) or "profane" ^F13 it, though his people profane his statutes, (Psalms 89:31) , he will not profane his covenant; though they violate his laws, he is a God keeping covenant with them, and will not break his word with them:

nor alter the thing that is gone out of my lips ;
any promise of his, respecting either the temporal, spiritual, or eternal welfare of his people: or "not change" ^F14 ; as he changes not in his nature and perfections, nor in his love and affections, nor in his counsels and purposes; so neither in his covenant and promises, they are always the same, and have a certain and unchangeable accomplishment; there is a performance of whatsoever is spoken by the Lord, (Luke 1:45) .

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FOOTNOTES:

• F13: (llxa al) "non prophanabo", V. L. Pagninus, Montanus, Tigurine version
• F14: (hnva al) "non mutabo", Pagninus, Montanus, Tigurine version, Junius & Tremellius